The writing process for the majority of Metallicaâs albums have followed the same process. A large slew of guitar riffs written primarily by James Hetfield, sometimes Kirk Hammett, and rarely the bandâs bass player, (that now being bass virtuoso Robert Trujillo) are reviewed and selected.
1 Delhi is most polluted city in the world in PM2.5 concentrations. 2  Half of the top 20 most polluted cities were in India, according to data.  PM2.5 is considered most harmful to health.
It is followed by Bangladesh, India, Nepal, China, Myanmar, Sri Lanka, South Korea, Indonesia, Philippines, Malaysia, Thailand, Singapore and Japan. Most Polluted Capital Cities. Air pollution in some Asian cities is so bad that at times, the cities are enveloped by a blanket of smog that impedes visibility.t is followed by Bangladesh, India, Nepal, China, Myanmar, Sri Lanka, South Korea, Indonesia, Philippines, Malaysia, Thailand, Singapore and Japan. Most Polluted Capital Cities. Air pollution in some Asian cities is so bad that at times, the cities are enveloped by a blanket of smog that impedes visibility.